scholarly journals A Comparative Study of Arch Width, Overjet and Overbite between Bilateral Congenital Missing Lateral Incisor and Normal Class I Occlusion

2021 ◽  
Keyword(s):  
Comparative Study ◽  
Class I ◽  
Lateral Incisor ◽  
Arch Width ◽  
Normal Class

scholarly journals Evaluation of Occlusal Contacts among Different Groups of Malocclusion using 3D Digital Models

2014 ◽  
Vol 15 (1) ◽  
pp. 46-55 ◽  
Author(s):  
Naim Z Al-Rayes ◽  
Mohammad Y Hajeer
Keyword(s):  
Class Ii ◽  
Sexual Differences ◽  
Class I ◽  
Stepwise Multiple Regression ◽  
Regression Equations ◽  
Class Iii ◽  
Digital Models ◽  
Arch Width ◽  
Division 1 ◽  
3D Digital Models

ABSTRACT Objectives (1) To evaluate the applicability of using 3D digital models in the assessment of the magnitude of occlusal contacts by measuring occlusal contact surface areas (OCSAs) and 3D mesh points in ‘contact’ (OCMPs) in a sample of orthodontic patients; (2) To detect any sex differences in the magnitude of occlusal contacts in all malocclusion groups; (3) To detect intergroup differences; (4) To assess possible correlations between occlusal contacts and other dental characteristics. Materials and methods Study casts of 120 malocclusion patients were selected and divided into 4 groups (class I division 1, class II division 1, class II division 2, class III) with equal numbers for both sexes. 3D digital models were produced using O3DM™ technology. Occlusal contacts were quantified using two methods of measuring. Results (1) No significant sexual differences were detected for OCMPs (mesh points) and OCSAs (mm2) in all groups. (2) There were statistically significant differences among malocclusion groups for OCMPs and OCSAs (p < 0.001). Tukey's HSD posthoc tests showed that class III patients had significantly less occlusal contacts than other malocclusion groups. (3) Stepwise multiple regression equations showed that overjet, lower arch width and overbite could explain approximately 19.5% of the total variance of OCSAs and OCMPs. Conclusion Sexual differences in occlusal contacts were not detected. Class I division 1 patients had the highest amount of occlusal contacts among all groups of malocclusion. Overjet, overbite and lower dental arch width were best predictors of occlusal contacts in the current sample. How to cite this article Al-Rayes NZ, Hajeer MY. Evaluation of Occlusal Contacts among Different Groups of Malocclusion using 3D Digital Models. J Contemp Dent Pract 2014;15(1):46-55.

scholarly journals Comparison of arch width, alveolar width and buccolingual inclination of teeth between Class II division 1 malocclusion and Class I occlusion

2012 ◽  
Vol 83 (2) ◽  
pp. 246-252 ◽  
Author(s):  
Rui Shu ◽  
Xianglong Han ◽  
Yating Wang ◽  
Hui Xu ◽  
Dongqing Ai ◽  
...  
Keyword(s):  
Class Ii ◽  
Class I ◽  
Posterior Teeth ◽  
Mandibular Arch ◽  
Arch Width ◽  
Significant Difference ◽  
Division 1 ◽  
Maxillary Premolars ◽  
Mandibular Posterior Teeth ◽  
Class Ii Division 1

ABSTRACT Objective: To compare the arch width, alveolar width, and buccolingual inclination of maxillary and mandibular posterior teeth between Class II division 1 malocclusion and Class I occlusion. Materials and Methods: Forty-five subjects with Class I occlusion and 45 subjects with Class II division 1 malocclusion were selected to measure the maxillary and mandibular arch width and alveolar width of premolars and first molars with digital caliper. Buccolingual inclination of maxillary and mandibular premolars and first molars were measured with a modified universal bevel protractor. Results: All of the posterior teeth in both groups were lingually tilted. The maxillary premolars and first molars were significantly more lingually tilted (P &lt; .05) in Class II division 1 malocclusion than in Class I occlusion. Mandibular first premolars were significantly less lingually tilted in Class II division 1 malocclusion than in Class I occlusion. No significant difference of buccolingual inclination was found in mandibular second premolars and first molars between the two groups. No significant difference in maxillary and mandibular arch width and alveolar width was found between the two groups. Conclusions: Buccolingual inclination rather than arch width and alveolar width plays an important role in transverse discrepancy of Class II division 1 malocclusion.

Regulation of interference-sensitive crossover distribution ensures crossover assurance in Arabidopsis

2021 ◽  
Vol 118 (47) ◽  
pp. e2107543118
Author(s):  
Xiang Li ◽  
Jun Zhang ◽  
Jiyue Huang ◽  
Jing Xu ◽  
Zhiyu Chen ◽  
...  
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Arabidopsis Thaliana ◽  
Mus Musculus ◽  
Distribution Patterns ◽  
Underlying Mechanism ◽  
Class Ii ◽  
Class I ◽  
Wild Type ◽  
Chromosomal Segregation ◽  
Normal Class

During meiosis, crossovers (COs) are typically required to ensure faithful chromosomal segregation. Despite the requirement for at least one CO between each pair of chromosomes, closely spaced double COs are usually underrepresented due to a phenomenon called CO interference. Like Mus musculus and Saccharomyces cerevisiae, Arabidopsis thaliana has both interference-sensitive (Class I) and interference-insensitive (Class II) COs. However, the underlying mechanism controlling CO distribution remains largely elusive. Both AtMUS81 and AtFANCD2 promote the formation of Class II CO. Using both AtHEI10 and AtMLH1 immunostaining, two markers of Class I COs, we show that AtFANCD2 but not AtMUS81 is required for normal Class I CO distribution among chromosomes. Depleting AtFANCD2 leads to a CO distribution pattern that is intermediate between that of wild-type and a Poisson distribution. Moreover, in Atfancm, Atfigl1, and Atrmi1 mutants where increased Class II CO frequency has been reported previously, we observe Class I CO distribution patterns that are strikingly similar to Atfancd2. Surprisingly, we found that AtFANCD2 plays opposite roles in regulating CO frequency in Atfancm compared with either in Atfigl1 or Atrmi1. Together, these results reveal that although AtFANCD2, AtFANCM, AtFIGL1, and AtRMI1 regulate Class II CO frequency by distinct mechanisms, they have similar roles in controlling the distribution of Class I COs among chromosomes.

Comparative study of intramandibular glands of workers, queens and males of stingless bee Scaptotrigona postica Latreille (Hymenoptera: Meliponini)

2013 ◽  
Vol 63 (1) ◽  
pp. 21-31
Author(s):  
Daniela A. Maschio ◽  
Luciana F. Gracioli-Vitti ◽  
Carminda Cruz-Landim
Keyword(s):  
Comparative Study ◽  
Stingless Bee ◽  
Class I ◽  
Gland Size ◽  
Histological Sections ◽  
Life Phase ◽  
Scaptotrigona Postica ◽  
I Cells ◽  
Sexually Mature ◽  
Eusocial Species

The mandibles of bees contain two types of tegumental glands whose function is not clear, despite the hypotheses put forward by several researchers. Although these glands have been found in all the bee species studied so far, observations have been confined mostly to workers of eusocial species in the forager phase. The work reported here involved a study of the morphology of the glands of newly emerged, nurse and forager workers, virgin and fecundated queens, and newly emerged and sexually mature males of Scaptotrigona postica, seeking to identify changes that may be linked to the bee’s life phase. Our findings indicate that the two types of glands are present in the species but not in all life phases or individual classes. The glands consisting of class I cells, the epithelial glands are present only in forager workers and fecundated queens. Glands of type III cells were studied in detail, and gland size was estimated from histological sections. The degree of development of the glands varies according to individual classes and life phases, suggesting different functions during the individual’s life and from one individual to another.

A comparative study of MHC class I expression in trophoblast

1997 ◽  
Vol 34 (1) ◽  
pp. 16-17
Author(s):  
S.A. Ellis ◽  
D.R.J. Bainbridge ◽  
I.L. Sargent ◽  
D.F. Antczak
Keyword(s):  
Comparative Study ◽  
Mhc Class I ◽  
Class I

scholarly journals Assessment of arch width changes in Class I and Class II Division 1 patients treated with fixed orthodontics

2021 ◽  
Vol 14 (1) ◽  
pp. 3-7
Author(s):  
Umesh Parajuli ◽  
Manish Bajracharya ◽  
Manju Pandey ◽  
Ima Gurung ◽  
Sapna Laxmi Tuladhar
Keyword(s):  
Study Groups ◽  
Class Ii ◽  
Cross Sectional Study ◽  
T Test ◽  
Post Treatment ◽  
Class I ◽  
Sectional Study ◽  
Cross Sectional ◽  
Arch Width ◽  
Treatment Changes

Background: The orthodontic treatment should aim to maintain the inter-canine and inter-molar width to that of the pre-treatment values. The study was conducted with objective to evaluate arch width changes in Class I and Class II patients treated with fixed orthodontics. Methods: This was a hospital-based cross-sectional study with two study groups. The first group included patients with Class I malocclusion, treated with four first premolar extractions and the second group included patients with Class II Div 1 malocclusion, treated with upper two first premolar extractions. The inter-canine and inter-molar width of the pre and post-treatment study model were measured. To compare the changes observed amongst two groups, independent samples t-test was performed. A paired sample t-test was used to evaluate the treatment changes within each group. Results: There was significant increase in inter-canine width in both maxillary and mandibular arches in both the groups. In Class I extraction group there was significant decrease in the inter-molar width in both maxillary and mandibular arches. The Class II Div1 maxillary extraction group also showed significant increase in inter-canine width in both maxillary and mandibular arches. In the same group there was decrease in post treatment Methods: This was a hospital-based cross-sectional study with two study groups. The first group included patients with Class I malocclusion, treated with four first premolar extractions and the second group included patients with Class II Div 1 malocclusion, treated with upper two first premolar extractions. The inter-canine and inter-molar width of the pre and post-treatment study model were measured. To compare the changes observed amongst two groups, independent samples t-test was performed.  A paired sample t-test was used to evaluate the treatment changes within each group. Results: There was significant increase in inter-canine width in both maxillary and mandibular arches in both the groups. In Class I extraction group there was significant decrease in the inter-molar width in both maxillary and mandibular arches. The Class II Div1 maxillary extraction group also showed significant increase in inter-canine width in both maxillary and mandibular arches. In the same group there was decrease in post-treatment inter-molar width in both arches with significant decrease in the maxillary inter-molar width. Conclusion: There was increase in inter-canine width in both Class I extraction group and Class II Div 1 maxillary extraction group with decrease in inter-molar width in both the groups.  

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